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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | $ 1,966,432 |
Accumulated impairment, beginning balance | (97,832) |
Goodwill, beginning balance | 1,868,600 |
Goodwill acquired | 43,181 | $ 344,200
Purchase price allocation adjustments | 51 |
Foreign currency translation adjustments | (14,168) |
Goodwill gross, ending balance | 1,994,776 | 1,994,776
Accumulated impairment, ending balance | (97,112) | (97,112)
Goodwill, ending balance | 1,897,664 | 1,897,664
Electric Power Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 1,272,527 |
Accumulated impairment, beginning balance | 0 |
Goodwill, beginning balance | 1,272,527 |
Goodwill acquired | 43,181 |
Purchase price allocation adjustments | 51 |
Foreign currency translation adjustments | (8,772) |
Goodwill gross, ending balance | 1,306,987 | 1,306,987
Accumulated impairment, ending balance | 0 | 0
Goodwill, ending balance | 1,306,987 | 1,306,987
Oil and Gas Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 693,905 |
Accumulated impairment, beginning balance | (97,832) |
Goodwill, beginning balance | 596,073 |
Goodwill acquired | 0 |
Purchase price allocation adjustments | 0 |
Foreign currency translation adjustments | (5,396) |
Goodwill gross, ending balance | 687,789 | 687,789
Accumulated impairment, ending balance | (97,112) | (97,112)
Goodwill, ending balance | $ 590,677 | $ 590,677

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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